New paramagnetic susceptibility thermometers for fundamental physics measurements

D. A. Sergatskov, P. K. Day, A. V. Babkin, R. C. Nelson, T. D. McCarson, S. T. P. Boyd, Robert Duncan

Research output: Contribution to conferencePaper


New paramagnetic susceptibility thermometers have been developed for use in fundamental physics missions in earth orbit. These devices use a SQUID magnetometer to measure the variation in the dc magnetization of a thermometric element that consists of a dilute concentration of manganese in a palladium matrix. Near 2.2 K these new PdMn thermometers have demonstrated a temperature resolution of better than 100 pK/radicHz and a time constant of 50 ms when operated with a 50 K/W thermal resistance to the liquid helium sample. These thermometers have been observed to be remarkably stable, with a drift of less than 10 fK/s. The observed power spectral density of the noise from these thermometers is consistent with separate measurements of the device’s time constant and thermal standoff from the bath. Recently these PdMn materials have been made into thin films and microstructures for use in future studies of quantum liquids, and for possible use in a new class of bolometers; and radiometers
Original languageEnglish
StatePublished - 2003


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